feat: refactor logging and execution plan handling, introducing RunLogService for improved structure

internal/ai/skills/runtime.go

@@ -2,8 +2,6 @@ package skills
 
 import (
 	"context"
-
-	"cs-agent/internal/models"
 )
 
 // BuildExecutionPlan 构建当前请求的 Skill 执行计划。
@@ -11,11 +9,6 @@ func BuildExecutionPlan(execCtx context.Context, ctx RuntimeContext) (*Execution
 	return RuntimeService.BuildExecutionPlan(execCtx, ctx)
 }
 
-// WriteRunLog 写入 Skill 路由日志。
-func WriteRunLog(log *models.SkillRunLog) error {
-	return RuntimeService.WriteRunLog(log)
-}
-
 // Select 执行一次 Skill 路由并记录路由日志。
 func Select(ctx context.Context, runtimeCtx RuntimeContext) (*ExecutionResult, error) {
 	return RuntimeService.Select(ctx, runtimeCtx)